drivers/usb/host/ohci-lpc32xx.c

   1 /*
   2  * Copyright (C) 2008 by NXP Semiconductors
   3  * @Author: Based on code by Kevin Wells
   4  * @Descr: USB driver - Embedded Artists LPC3250 OEM Board support functions
   5  *
   6  * Copyright (c) 2015 Tyco Fire Protection Products.
   7  *
   8  * SPDX-License-Identifier:     GPL-2.0+
   9  */
  10
  11 #include <common.h>
  12 #include <errno.h>
  13 #include <wait_bit.h>
  14 #include <asm/io.h>
  15 #include <asm/arch/cpu.h>
  16 #include <asm/arch/clk.h>
  17 #include <usb.h>
  18 #include <i2c.h>
  19
  20 /* OTG I2C controller module register structures */
  21 struct otgi2c_regs {
  22         u32 otg_i2c_txrx;   /* OTG I2C Tx/Rx Data FIFO */
  23         u32 otg_i2c_stat;   /* OTG I2C Status Register */
  24         u32 otg_i2c_ctrl;   /* OTG I2C Control Register */
  25         u32 otg_i2c_clk_hi; /* OTG I2C Clock Divider high */
  26         u32 otg_i2c_clk_lo; /* OTG I2C Clock Divider low */
  27 };
  28
  29 /* OTG controller module register structures */
  30 struct otg_regs {
  31         u32 reserved1[64];
  32         u32 otg_int_sts;    /* OTG int status register */
  33         u32 otg_int_enab;   /* OTG int enable register */
  34         u32 otg_int_set;    /* OTG int set register */
  35         u32 otg_int_clr;    /* OTG int clear register */
  36         u32 otg_sts_ctrl;   /* OTG status/control register */
  37         u32 otg_timer;      /* OTG timer register */
  38         u32 reserved2[122];
  39         struct otgi2c_regs otg_i2c;
  40         u32 reserved3[824];
  41         u32 otg_clk_ctrl;   /* OTG clock control reg */
  42         u32 otg_clk_sts;    /* OTG clock status reg */
  43 };
  44
  45 /* otg_sts_ctrl register definitions */
  46 #define OTG_HOST_EN                     (1 << 0) /* Enable host mode */
  47
  48 /* otg_clk_ctrl and otg_clk_sts register definitions */
  49 #define OTG_CLK_AHB_EN                  (1 << 4) /* Enable AHB clock */
  50 #define OTG_CLK_OTG_EN                  (1 << 3) /* Enable OTG clock */
  51 #define OTG_CLK_I2C_EN                  (1 << 2) /* Enable I2C clock */
  52 #define OTG_CLK_HOST_EN                 (1 << 0) /* Enable host clock */
  53
  54 /* ISP1301 USB transceiver I2C registers */
  55 #define MC1_SPEED_REG                   (1 << 0)
  56 #define MC1_DAT_SE0                     (1 << 2)
  57 #define MC1_UART_EN                     (1 << 6)
  58
  59 #define MC2_SPD_SUSP_CTRL               (1 << 1)
  60 #define MC2_BI_DI                       (1 << 2)
  61 #define MC2_PSW_EN                      (1 << 6)
  62
  63 #define OTG1_DP_PULLUP                  (1 << 0)
  64 #define OTG1_DM_PULLUP                  (1 << 1)
  65 #define OTG1_DP_PULLDOWN                (1 << 2)
  66 #define OTG1_DM_PULLDOWN                (1 << 3)
  67 #define OTG1_VBUS_DRV                   (1 << 5)
  68
  69 #define ISP1301_I2C_ADDR                CONFIG_USB_ISP1301_I2C_ADDR
  70
  71 #define ISP1301_I2C_MODE_CONTROL_1_SET          0x04
  72 #define ISP1301_I2C_MODE_CONTROL_1_CLR          0x05
  73 #define ISP1301_I2C_MODE_CONTROL_2_SET          0x12
  74 #define ISP1301_I2C_MODE_CONTROL_2_CLR          0x13
  75 #define ISP1301_I2C_OTG_CONTROL_1_SET           0x06
  76 #define ISP1301_I2C_OTG_CONTROL_1_CLR           0x07
  77 #define ISP1301_I2C_INTERRUPT_LATCH_CLR         0x0B
  78 #define ISP1301_I2C_INTERRUPT_FALLING_CLR       0x0D
  79 #define ISP1301_I2C_INTERRUPT_RISING_CLR        0x0F
  80
  81 static struct otg_regs *otg = (struct otg_regs *)USB_BASE;
  82 static struct clk_pm_regs *clk_pwr = (struct clk_pm_regs *)CLK_PM_BASE;
  83
  84 static int isp1301_set_value(int reg, u8 value)
  85 {
  86         return i2c_write(ISP1301_I2C_ADDR, reg, 1, &value, 1);
  87 }
  88
  89 static void isp1301_configure(void)
  90 {
  91         i2c_set_bus_num(I2C_2);
  92
  93         /*
  94          * LPC32XX only supports DAT_SE0 USB mode
  95          * This sequence is important
  96          */
  97
  98         /* Disable transparent UART mode first */
  99         isp1301_set_value(ISP1301_I2C_MODE_CONTROL_1_CLR, MC1_UART_EN);
 100
 101         isp1301_set_value(ISP1301_I2C_MODE_CONTROL_1_CLR, ~MC1_SPEED_REG);
 102         isp1301_set_value(ISP1301_I2C_MODE_CONTROL_1_SET, MC1_SPEED_REG);
 103         isp1301_set_value(ISP1301_I2C_MODE_CONTROL_2_CLR, ~0);
 104         isp1301_set_value(ISP1301_I2C_MODE_CONTROL_2_SET,
 105                           MC2_BI_DI | MC2_PSW_EN | MC2_SPD_SUSP_CTRL);
 106
 107         isp1301_set_value(ISP1301_I2C_OTG_CONTROL_1_CLR, ~0);
 108         isp1301_set_value(ISP1301_I2C_MODE_CONTROL_1_SET, MC1_DAT_SE0);
 109         isp1301_set_value(ISP1301_I2C_OTG_CONTROL_1_SET,
 110                           OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN);
 111         isp1301_set_value(ISP1301_I2C_OTG_CONTROL_1_CLR,
 112                           OTG1_DM_PULLUP | OTG1_DP_PULLUP);
 113         isp1301_set_value(ISP1301_I2C_INTERRUPT_LATCH_CLR, ~0);
 114         isp1301_set_value(ISP1301_I2C_INTERRUPT_FALLING_CLR, ~0);
 115         isp1301_set_value(ISP1301_I2C_INTERRUPT_RISING_CLR, ~0);
 116
 117         /* Enable usb_need_clk clock after transceiver is initialized */
 118         setbits_le32(&clk_pwr->usb_ctrl, CLK_USBCTRL_USBDVND_EN);
 119 }
 120
 121 static int usbpll_setup(void)
 122 {
 123         u32 ret;
 124
 125         /* make sure clocks are disabled */
 126         clrbits_le32(&clk_pwr->usb_ctrl,
 127                      CLK_USBCTRL_CLK_EN1 | CLK_USBCTRL_CLK_EN2);
 128
 129         /* start PLL clock input */
 130         setbits_le32(&clk_pwr->usb_ctrl, CLK_USBCTRL_CLK_EN1);
 131
 132         /* Setup PLL. */
 133         setbits_le32(&clk_pwr->usb_ctrl,
 134                      CLK_USBCTRL_FDBK_PLUS1(192 - 1));
 135         setbits_le32(&clk_pwr->usb_ctrl, CLK_USBCTRL_POSTDIV_2POW(0x01));
 136         setbits_le32(&clk_pwr->usb_ctrl, CLK_USBCTRL_PLL_PWRUP);
 137
 138         ret = wait_for_bit(__func__, &clk_pwr->usb_ctrl, CLK_USBCTRL_PLL_STS,
 139                            true, CONFIG_SYS_HZ, false);
 140         if (ret)
 141                 return ret;
 142
 143         /* enable PLL output */
 144         setbits_le32(&clk_pwr->usb_ctrl, CLK_USBCTRL_CLK_EN2);
 145
 146         return 0;
 147 }
 148
 149 int usb_cpu_init(void)
 150 {
 151         u32 ret;
 152
 153         /*
 154          * USB pins routing setup is done by "lpc32xx_usb_init()" and should
 155          * be call by board "board_init()" or "misc_init_r()" functions.
 156          */
 157
 158         /* enable AHB slave USB clock */
 159         setbits_le32(&clk_pwr->usb_ctrl,
 160                      CLK_USBCTRL_HCLK_EN | CLK_USBCTRL_BUS_KEEPER);
 161
 162         /* enable I2C clock */
 163         writel(OTG_CLK_I2C_EN, &otg->otg_clk_ctrl);
 164         ret = wait_for_bit(__func__, &otg->otg_clk_sts, OTG_CLK_I2C_EN, true,
 165                            CONFIG_SYS_HZ, false);
 166         if (ret)
 167                 return ret;
 168
 169         /* Configure ISP1301 */
 170         isp1301_configure();
 171
 172         /* setup USB clocks and PLL */
 173         ret = usbpll_setup();
 174         if (ret)
 175                 return ret;
 176
 177         /* enable usb_host_need_clk */
 178         setbits_le32(&clk_pwr->usb_ctrl, CLK_USBCTRL_USBHSTND_EN);
 179
 180         /* enable all needed USB clocks */
 181         const u32 mask = OTG_CLK_AHB_EN | OTG_CLK_OTG_EN |
 182                          OTG_CLK_I2C_EN | OTG_CLK_HOST_EN;
 183         writel(mask, &otg->otg_clk_ctrl);
 184
 185         ret = wait_for_bit(__func__, &otg->otg_clk_sts, mask, true,
 186                            CONFIG_SYS_HZ, false);
 187         if (ret)
 188                 return ret;
 189
 190         setbits_le32(&otg->otg_sts_ctrl, OTG_HOST_EN);
 191         isp1301_set_value(ISP1301_I2C_OTG_CONTROL_1_SET, OTG1_VBUS_DRV);
 192
 193         return 0;
 194 }
 195
 196 int usb_cpu_stop(void)
 197 {
 198         /* vbus off */
 199         isp1301_set_value(ISP1301_I2C_OTG_CONTROL_1_SET, OTG1_VBUS_DRV);
 200
 201         clrbits_le32(&otg->otg_sts_ctrl, OTG_HOST_EN);
 202
 203         clrbits_le32(&clk_pwr->usb_ctrl, CLK_USBCTRL_HCLK_EN);
 204
 205         return 0;
 206 }
 207
 208 int usb_cpu_init_fail(void)
 209 {
 210         return usb_cpu_stop();
 211 }